HomeFish encyclopediaRay-finned fishesBony tonguesElephantfishesDark stonebasher Dark stonebasher (Pollimyrus nigricans) Scientific name: Pollimyrus nigricans Boulenger, 1906 The Dark stonebasher (Pollimyrus nigricans) is a freshwater fish of the family Mormyridae. Native range: Africa, Lakes Victoria, Nabugabo and Kyoga; the Kiruni River (Semliki Valley), Malagarasi River and Tanganyika Lake. BiologyFavors the shallow mud bottom waters near fringing vegetation such as papyrus and Vossia. Feeds mainly on Caridina and caenid larvae. Oviparous. A male to female ratio of 1:10.5 has been noted for this species. Migrates up the river to spawn.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePollimyrus nigricansFamilyMormyridae (Elephantfishes)OrderOsteoglossiformes (Bony tongues)ClassActinopterygii (Ray-finned fishes)Maximum length10.0EnvironmentFreshwater; demersal; potamodromousClimateTropicalDistributionAfrica: Lakes Victoria, Nabugabo and Kyoga; the Kiruni River (Semliki Valley), Malagarasi River and Tanganyika Lake.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Fec = 206) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026